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Journal articles on the topic 'Hertzsprung–Russell diagram'

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Published: 14 March 2023

Last updated: 31 July 2025

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1

Langer, N., and R. P. Kudritzki. "The spectroscopic Hertzsprung-Russell diagram." Astronomy & Astrophysics 564 (April 2014): A52. http://dx.doi.org/10.1051/0004-6361/201423374.

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MacLeod, Morgan, Matteo Cantiello, and Melinda Soares-Furtado. "Planetary Engulfment in the Hertzsprung–Russell Diagram." Astrophysical Journal 853, no. 1 (2018): L1. http://dx.doi.org/10.3847/2041-8213/aaa5fa.

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3

van Loon, Jacco Th. "Cool Stars in the Hertzsprung–Russell Diagram." Proceedings of the International Astronomical Union 11, A29B (2015): 475–77. http://dx.doi.org/10.1017/s1743921316005925.

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AbstractAs the opening review to the focus meeting “Stellar Behemoths: Red Supergiants across the Local Universe”, I here provide a brief introduction to red supergiants, setting the stage for subsequent contributions. I highlight some recent activity in the field, and identify areas of progress, areas where progress is needed, and how such progress might be achieved.

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4

Christensen-Dalsgaard, Jørgen. "A Hertzsprung-Russell diagram for stellar oscillations." Symposium - International Astronomical Union 123 (1988): 295–98. http://dx.doi.org/10.1017/s0074180900158279.

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I present evolutionary tracks and curves of constant central hydrogen abundance in diagrams based on frequencies of high-order, low-degree p modes. For stars with masses between 0.7 and 1.5 M⊙, a clean separation is obtained between the effects of varying mass and varying evolutionary state.

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5

van, den Broek Jos, and Pedro Russo. "Hertzsprung and Russel: The Minards of Astronomy." Communicating Astronomy with the Public Journal 8, no. 1 (2014): 17–19. https://doi.org/10.5281/zenodo.14928235.

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This article will explore the history of flow maps, the extent of their use and how astronomy has benefited from this illustrative way of communicating ideas. Flow maps are multidimensional infographics that tell a long story in one single image. In 1812 the French civil engineer Charles Joseph Minard created a flow map that is still dubbed “the mother of all flow maps”, summarising Napoleon’s Russian campaign (Figure 1). Almost 100 years later, in 1910, Ejnar Hertzsprung and Henry Norris Russell created a multidimensional flow map that arguably surpasses Minard’s

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6

Zaninetti, L. "Semi-analytical formulas for the Hertzsprung-Russell diagram." Serbian Astronomical Journal, no. 177 (2008): 73–85. http://dx.doi.org/10.2298/saj0877073z.

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The absolute visual magnitude as function of the observed color (B-V), also named Hertzsprung-Russell diagram, can be described through five equations; that when calibrated stars are available means eight constants. The developed framework allows to deduce the remaining physical parameters, mass, radius and luminosity. This new technique is applied to the first 10 pc, the first 50 pc, the Hyades and to the determination of the distance of a cluster. The case of the white dwarfs is analyzed assuming the absence of calibrated data: our equation produces a smaller ?2 with respect to the standard

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7

Doom, C., J. P. de Greve, and C. de Loore. "Stellar evolution in the upper Hertzsprung-Russell diagram." Astrophysical Journal 303 (April 1986): 136. http://dx.doi.org/10.1086/164060.

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8

Hubrig, S., P. North, and G. Mathys. "Magnetic Ap Stars in the Hertzsprung‐Russell Diagram." Astrophysical Journal 539, no. 1 (2000): 352–63. http://dx.doi.org/10.1086/309189.

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9

Jao, Wei-Chun, and Gregory A. Feiden. "An Enhanced Hertzsprung–Russell Diagram Using Gaia EDR3 Data." Research Notes of the AAS 5, no. 5 (2021): 124. http://dx.doi.org/10.3847/2515-5172/ac053a.

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10

Farag, Ebraheem, F. X. Timmes, Morgan Taylor, Kelly M. Patton, and R. Farmer. "On Stellar Evolution in a Neutrino Hertzsprung–Russell Diagram." Astrophysical Journal 893, no. 2 (2020): 133. http://dx.doi.org/10.3847/1538-4357/ab7f2c.

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11

Arsentieva, A. A., and I. I. Shevchenko. "Host Stars of Planets on the Hertzsprung–Russell Diagram." Astronomy Letters 47, no. 9 (2021): 651–60. http://dx.doi.org/10.1134/s1063773721080016.

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12

Reed, B. Cameron. "Vela OB1: Probable New Members and Hertzsprung-Russell Diagram." Astronomical Journal 119, no. 4 (2000): 1855–59. http://dx.doi.org/10.1086/301313.

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13

Escorza, A., H. M. J. Boffin, A. Jorissen, et al. "Hertzsprung-Russell diagram and mass distribution of barium stars." Astronomy & Astrophysics 608 (December 2017): A100. http://dx.doi.org/10.1051/0004-6361/201731832.

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14

Castro, N., L. Fossati, N. Langer, S. Simón-Díaz, F. R. N. Schneider, and R. G. Izzard. "The spectroscopic Hertzsprung-Russell diagram of Galactic massive stars." Astronomy & Astrophysics 570 (October 2014): L13. http://dx.doi.org/10.1051/0004-6361/201425028.

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15

Feoli, A., та L. Mancini. "A HERTZSPRUNG-RUSSELL-LIKE DIAGRAM FOR GALAXIES: THEM•VERSUSMGσ2RELATION". Astrophysical Journal 703, № 2 (2009): 1502–10. http://dx.doi.org/10.1088/0004-637x/703/2/1502.

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16

de Jager, C., and H. Nieuwenhuijzen. "Stellar atmospheric instability in the upper part of the Hertzsprung-Russell diagram." Symposium - International Astronomical Union 116 (1986): 255–56. http://dx.doi.org/10.1017/s0074180900149046.

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The upper limt of stellar luminosity in the Hertzsprung-Russell diagram is a line running approximately from (log Teff; log (L/L⊙) = (4.5; 6.3) via (4.0; 5.74) to (3.5; 5.7) (Humphreys and Davidson, 1979; Humpreys, 1983).

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17

Jeffries, R. D. "Age spreads in star forming regions?" Proceedings of the International Astronomical Union 4, S258 (2008): 95–102. http://dx.doi.org/10.1017/s1743921309031743.

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AbstractRotation periods and projected equatorial velocities of pre-main-sequence (PMS) stars in star forming regions can be combined to give projected stellar radii. Assuming random axial orientation, a Monte-Carlo model is used to illustrate that distributions of projected stellar radii are very sensitive to ages and age dispersions between 1 and 10Myr which, unlike age estimates from conventional Hertzsprung-Russell diagrams, are relatively immune to uncertainties due to extinction, variability, distance etc. Application of the technique to the Orion Nebula cluster reveals radius spreads of

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18

de Jager, Cornells, and Arnout M. van Genderen. "Luminous Blue Variables need not be blue." International Astronomical Union Colloquium 113 (1989): 127–30. http://dx.doi.org/10.1017/s0252921100004371.

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AbstractA number of yellow and red super- and hypergiants show phenomena that are similar to those shown by Luminous Blue Variables. The LBV phenomenon may not be restricted to the blue part of the Hertzsprung-Russell diagram and the conventional name ‘S Dor variables’ seems more appropriate.

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19

Fang, Min, Jinyoung Serena Kim, Ilaria Pascucci, and Dániel Apai. "An Improved Hertzsprung–Russell Diagram for the Orion Trapezium Cluster." Astrophysical Journal 908, no. 1 (2021): 49. http://dx.doi.org/10.3847/1538-4357/abcec8.

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20

Daszyńska-Daszkiewicz, Jadwiga. "Energetic properties of stellar pulsations across the Hertzsprung-Russell diagram." EPJ Web of Conferences 101 (2015): 01002. http://dx.doi.org/10.1051/epjconf/201510101002.

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21

Escorza, A., H. M. J. Boffin, A. Jorissen, et al. "Hertzsprung-Russell diagram and mass distribution of barium stars (Corrigendum)." Astronomy & Astrophysics 625 (May 2019): C3. http://dx.doi.org/10.1051/0004-6361/201731832e.

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22

Handler, G. "The domain of Doradus variables in the Hertzsprung-Russell diagram." Monthly Notices of the Royal Astronomical Society 309, no. 2 (1999): L19—L23. http://dx.doi.org/10.1046/j.1365-8711.1999.03005.x.

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23

Schmitt, J. H. M. M. "Magnetic activity of cool stars in the Hertzsprung-Russell diagram." Proceedings of the International Astronomical Union 7, S286 (2011): 296–306. http://dx.doi.org/10.1017/s1743921312005005.

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AbstractI review the X-ray emission from cool stars with outer convection zones in comparison to the Sun with a focus on the properties of low-activity stars. I present the recent results of long-term X-ray monitoring which demonstrate the existence of X-ray cycles on stars with known calcium cycles. The evidence of a minimum stellar X-ray flux is presented and arguments are put forward for the view that the Sun in its extended minimum between 2008 - 2009 behaved very much like a Maunder-minimum Sun.

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24

Chu, You-Hua. "Ring nebulae around massive stars throughout the Hertzsprung-Russell diagram." Symposium - International Astronomical Union 212 (2003): 585–95. http://dx.doi.org/10.1017/s0074180900212965.

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Massive stars evolve across the H-R diagram, losing mass along the way and forming a variety of ring nebulae. During the main sequence stage, the fast stellar wind sweeps up the ambient interstellar medium to form an interstellar bubble. After a massive star evolves into a red giant or a luminous blue variable, it loses mass copiously to form a circumstellar nebula. As it evolves further into a WR star, the fast WR wind sweeps up the previous mass loss and forms a circumstellar bubble. Observations of ring nebulae around massive stars not only are fascinating, but also are useful in providing

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25

Scholz, G. "The position of ET And in the Hertzsprung-Russell diagram." Astronomische Nachrichten: A Journal on all Fields of Astronomy 307, no. 1 (1986): 21–25. http://dx.doi.org/10.1002/asna.2113070109.

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26

Malyuto, V., S. Zubarev, and T. Shvelidze. "Homogenized Hertzsprung-Russell diagram for the open cluster NGC 188." Astronomische Nachrichten 335, no. 8 (2014): 850–64. http://dx.doi.org/10.1002/asna.201312112.

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27

Bohannan, Bruce. "The distribution of types of Luminous Blue Variables." International Astronomical Union Colloquium 113 (1989): 35–44. http://dx.doi.org/10.1017/s0252921100004267.

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AbstractIf Luminous Blue Variables (LBVs) are not each unique types, three broad groups can be characterized depending on the luminosity and location ofLBVsin the Hertzsprung-Russell diagram. To assist in defining the evolutionary nature ofLBVs, connections are made to stars that have similar spectral character with the suggestion that some of these objects that may someday becomeLBVs.

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28

Cox, Arthur N., Joyce A. Guzik, Michael S. Soukup, and Siobahn M. Morgan. "Theoretical Pulsations of Luminous Blue Variables." International Astronomical Union Colloquium 155 (1995): 192–93. http://dx.doi.org/10.1017/s0252921100036952.

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AbstractBoth radial and low degree and order g-mode nonradial pulsations are predicted for luminous blue variables that occur in the blue supergiant region of the Hertzsprung-Russell diagram. It is found that the radial strange modes have very large growth rates due to helium ionization in models at surface effective temperatures between 10,000 and 20,000 K.

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29

Overduin, James, Jacob Buchman, Jonathan Perry, and Thomas Krause. "The Scourge of Online Solutions and an Academic Hertzsprung–Russell Diagram." Physics Educator 03, no. 02 (2021): 2150007. http://dx.doi.org/10.1142/s2661339521500074.

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We report on preliminary results of a statistical study of student performance in more than a decade of calculus-based introductory physics courses. Treating average homework and test grades as proxies for student effort and comprehension, respectively, we plot comprehension versus effort in an academic version of the astronomical Hertzsprung–Russell diagram (which plots stellar luminosity versus temperature). We study the evolution of this diagram with time, finding that the “academic main sequence” has begun to break down in recent years as student achievement on tests has become decoupled f

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30

ZHANG, CHENGMIN, YUANYUE PAN, and ALI TAANI. "PULSAR DISTRIBUTIONS IN THE MAGNETIC AND SPIN PERIOD DIAGRAM." International Journal of Modern Physics: Conference Series 23 (January 2013): 165–69. http://dx.doi.org/10.1142/s2010194513011240.

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The various types of pulsars are classified in the magnetic and spin period (B-P) diagram, by which one can recognize their properties there. We also investigate the relation of radio pulsars and X-ray neutron stars, and their distribution characteristics, implying their evolution links. B-P diagram is divided by the special lines, e.g. spin-up line and "death line", which indicate the evolution information of pulsars. Like Hertzsprung-Russell (H-R) diagram of showing the stellar evolution or "lives of stars", we try to develop B-P diagram as a function of representing the evolution track of n

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31

Wang, Song, Yu Bai, Lin He, and Jifeng Liu. "Stellar X-Ray Activity Across the Hertzsprung–Russell Diagram. I. Catalogs." Astrophysical Journal 902, no. 2 (2020): 114. http://dx.doi.org/10.3847/1538-4357/abb66d.

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32

Elbakyan, Vardan G., Eduard I. Vorobyov, Christian Rab, et al. "Episodic excursions of low-mass protostars on the Hertzsprung–Russell diagram." Monthly Notices of the Royal Astronomical Society 484, no. 1 (2018): 146–60. http://dx.doi.org/10.1093/mnras/sty3517.

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33

Scholz, R. D., S. Drew Chojnowski, and S. Hubrig. "Strongly magnetic Ap stars in the Gaia DR2 Hertzsprung-Russell diagram." Astronomy & Astrophysics 628 (August 2019): A81. http://dx.doi.org/10.1051/0004-6361/201935752.

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Context. Knowing the distribution of strongly magnetic Ap stars in the Hertzsprung-Russell diagram (HRD) allows us to study the evolution of their magnetic fields across the main sequence (MS). With a newly extended Ap star sample from APOGEE and available Gaia DR2 data, we can now critically review the results of previous studies based on HIPPARCOS data. Aims. To investigate our targets in the Gaia DR2 HRD, we need to define astrometric and photometric quality criteria to remove unreliable data from the HRD. Methods. We used the Gaia DR2 renormalised unit weight error RUWE as our main quality

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34

Bi, S. L., та N. Gai. "Solar-like oscillations in red giant ϵ Ophiuchi". Proceedings of the International Astronomical Union 4, S252 (2008): 243–44. http://dx.doi.org/10.1017/s1743921308022874.

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AbstractAsteroseismology is a powerful tool to help determining the internal structure of the stars. Solar-like oscillations have been discovered in the G9.5 red giant ϵ Ophiuchi, and it opened up a new part of the Hertzsprung-Russell diagram to be explored with asteroseismic techniques. We present the detailed study of the properties of ϵ Oph including convective overshooting and extra-mixing.

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35

Mirzoyan, L. V., V. V. Hambarian, and A. T. Garibjanian. "Spectral observations of flare stars." Symposium - International Astronomical Union 137 (1990): 95–98. http://dx.doi.org/10.1017/s0074180900187510.

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Spectral observations of 6 flare stars in the Pleiades cluster are carried out which occupy different positions on the Hertzsprung-Russell diagram relative to the main sequence: above and below it. The spectral indices which are sensible to luminosity or temperature of the star photosphere are determined. Significant differences between indices of the stars belongings to these two groups are not detected.

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36

Nardetto, Nicolas, Jesper Storm, Wolfgang Gieren, Grzegorz Pietrzyński, and Ennio Poretti. "The Araucaria Project: the Baade-Wesselink projection factor of pulsating stars." Proceedings of the International Astronomical Union 9, S301 (2013): 145–48. http://dx.doi.org/10.1017/s1743921313014233.

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AbstractThe projection factor used in the Baade-Wesselink method of determining the distance of Cepheids makes the link between stellar physics and the cosmological distance scale. A coherent picture of this physical quantity is now provided based on several approaches. We present the latest news on the expected projection factor for different kinds of pulsating stars in the Hertzsprung-Russell diagram.

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37

Couteau, P. "Un Diagramme Fondamental Luminosite-Type Spectral Pour Les Etoiles Doubles." Symposium - International Astronomical Union 111 (1985): 391–96. http://dx.doi.org/10.1017/s0074180900079043.

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In the Hertzsprung-Russell diagram, which is not well known for the binary stars, we can use the unit-mass brightness instead of the brightness itself. For each component this parameter can be obtained using the photometry and the orbital elements of the system. It is only through the orbital constant that the parallax comes in the calculation. This new diagram can be applied to any component of binary stars which orbit and class are known. By using a mass luminosity relationship one can define the zero-age main sequence on the diagram. The evolved stars can thus easily be noticed on the diagr

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38

Meyer, D. M.-A., L. Haemmerlé, and E. I. Vorobyov. "On the episodic excursions of massive protostars in the Hertzsprung–Russell diagram." Monthly Notices of the Royal Astronomical Society 484, no. 2 (2019): 2482–98. http://dx.doi.org/10.1093/mnras/sty3527.

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39

Abril, Javier, Linda Schmidtobreick, Alessandro Ederoclite, and Carlos López-Sanjuan. "Disentangling cataclysmic variables in Gaia’s HR diagram." Monthly Notices of the Royal Astronomical Society: Letters 492, no. 1 (2019): L40—L44. http://dx.doi.org/10.1093/mnrasl/slz181.

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ABSTRACT Cataclysmic variables (CVs) are interacting binaries consisting of at least three components that control their colour and magnitude. Using Gaia, we here investigate the influence of the physical properties of these binaries on their position in the Hertzsprung–Russell (HR) diagram. The CVs are on average located between the main sequence and the white dwarf regime, the maximum density being at GBP − GRP ∼ 0.56 and Gabs ∼ 10.15. We find a trend of the orbital period with colour and absolute brightness: with decreasing period, the CVs become bluer and fainter. We also identify the loca

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40

Cheng, Sihao. "Two delays in white dwarf evolution revealed by Gaia." Proceedings of the International Astronomical Union 15, S357 (2019): 175–78. http://dx.doi.org/10.1017/s1743921320000460.

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AbstractBy comparing two age indicators of high-mass white dwarfs (WDs) derived from Gaia data, two discoveries have been made recently: one is the existence of a cooling anomaly that produces the Q branch structure on the Hertzsprung–Russell diagram, and the other is the existence of high-mass WDs as double-WD merger products. The former poses a challenge for WD cooling models, and the latter has implications on binary evolution and type-Ia supernovae.

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41

Shibata, Kazunari, and Takaaki Yokoyama. "A Hertzsprung‐Russell–like Diagram for Solar/Stellar Flares and Corona: Emission Measure versus Temperature Diagram." Astrophysical Journal 577, no. 1 (2002): 422–32. http://dx.doi.org/10.1086/342141.

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42

Evans, Christopher J. "The properties of early-type stars in the Magellanic Clouds." Proceedings of the International Astronomical Union 4, S256 (2008): 325–36. http://dx.doi.org/10.1017/s1743921308028664.

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AbstractThe past decade has witnessed impressive progress in our understanding of the physical properties of massive stars in the Magellanic Clouds, and how they compare to their cousins in the Galaxy. I summarise new results in this field, including evidence for reduced mass-loss rates and faster stellar rotational velocities in the Clouds, and their present-day compositions. I also discuss the stellar temperature scale, emphasizing its dependence on metallicity across the entire upper-part of the Hertzsprung-Russell diagram.

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43

Mowlavi, Nami, Sophie Saesen, Fabio Barblan, and Laurent Eyer. "On the new late B- and early A-type periodic variable stars." Proceedings of the International Astronomical Union 9, S301 (2013): 43–46. http://dx.doi.org/10.1017/s1743921313014051.

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AbstractWe summarize the properties of the new periodic, small-amplitude, variable stars recently discovered in the open cluster NGC 3766. They are located in the region of the Hertzsprung-Russell diagram between δ Sct and slowly pulsating B stars, a region where no sustained pulsation is predicted by standard models. The origin of their periodic variability is currently unknown. We also discuss how the Gaia mission, launched at the end of 2013, can contribute to our knowledge of those stars.

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44

Werner, Klaus, Stefan Dreizler, Ulrich Heber, and Thomas Rauch. "Confining the Edges of the GW Vir Instability Strip." International Astronomical Union Colloquium 152 (1996): 229–34. http://dx.doi.org/10.1017/s0252921100036022.

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We report on our NLTE model atmosphere analyses of PG 1159 stars. The results enable us to confine the location of the GWVir instability region in the Hertzsprung-Russell diagram. The analysis of a spectrum of the non-pulsator PG 1520+525 taken with the EUVE satellite in comparison with HST data of the pulsating protoype PG 1159-035 (=GW Vir) locates the blue edge of the instability strip near Teff=140 000 K for stars in the respective luminosity range.

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45

Shetye, Shreeya, Sophie Van Eck, Alain Jorissen, Hans Van Winckel, and Lionel Siess. "The TGAS HR diagram of S-type stars." Proceedings of the International Astronomical Union 12, S330 (2017): 345–47. http://dx.doi.org/10.1017/s1743921317005610.

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AbstractS-type stars are late-type giants enhanced with s-process elements originating either from nucleosynthesis during the Asymptotic Giant Branch (AGB) or from a pollution by a binary companion. The former are called intrinsic S stars, and the latter extrinsic S stars. The atmospheric parameters of S stars are more numerous than those of M-type giants (C/O ratio and s-process abundances affect the thermal structure and spectral synthesis), and hence they are more difficult to derive. Nevertheless, high-resolution spectroscopic data of S stars combined with the TGAS (Tycho-Gaia Astrometric

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46

Gregory, S. G., J. F. Donati, J. Morin, et al. "Can we predict the magnetic properties of PMS stars from their H-R diagram location?" Proceedings of the International Astronomical Union 9, S302 (2013): 40–43. http://dx.doi.org/10.1017/s1743921314001677.

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AbstractSpectropolarimetric observations combined with tomographic imaging techniques have revealed that all pre-main sequence (PMS) stars host multipolar magnetic fields, ranging from strong and globally axisymmetric with ≳kilo-Gauss dipole components, to complex and non-axisymmetric with weak dipole components (≲0.1 kG). Many host dominantly octupolar large-scale fields. We argue that the large-scale magnetic properties of a PMS star are related to its location in the Hertzsprung-Russell diagram. This conference paper is a synopsis of Gregory et al. (2012), updated to include the latest resu

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47

Bowman, D. M., S. Burssens, S. Simón-Díaz, et al. "Photometric detection of internal gravity waves in upper main-sequence stars." Astronomy & Astrophysics 640 (August 2020): A36. http://dx.doi.org/10.1051/0004-6361/202038224.

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Context. Massive stars are predicted to excite internal gravity waves (IGWs) by turbulent core convection and from turbulent pressure fluctuations in their near-surface layers. These IGWs are extremely efficient at transporting angular momentum and chemical species within stellar interiors, but they remain largely unconstrained observationally. Aims. We aim to characterise the photometric detection of IGWs across a large number of O and early-B stars in the Hertzsprung–Russell diagram, and explain the ubiquitous detection of stochastic variability in the photospheres of massive stars. Methods.

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48

Szczerba, R. "A New Method for Observational Testing of the Planetary Nebulae Nuclei Evolution." Symposium - International Astronomical Union 131 (1989): 539. http://dx.doi.org/10.1017/s0074180900139105.

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Planetary nebulae (PNe) are very useful as a tool for testing the theory of stellar evolution. The most widely applied method in this respect is the Hertzsprung-Russell (H-R) diagram. However, the observed positions of planetary nebulae nuclei (PNNi) on the H-R diagram are subject to large uncertainties, mostly due to inaccurate distances to them. On the other hand, the (absolute visual magnitude, age)-diagram also is not free of this problem. Therefore, an attempt has been done to develop a new method which is distance-independent. For comparison between theory and observations we propose the

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49

Georgy, Cyril. "Evolution models of red supergiants." Proceedings of the International Astronomical Union 12, S329 (2016): 193–98. http://dx.doi.org/10.1017/s1743921317003179.

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AbstractThe red supergiant (RSG) phase is a key stage for the evolution of massive stars. The current uncertainties about the mass-loss rates of these objects make their evolution far to be fully understood. In this paper, we discuss some of the physical processes that determine the duration of the RSG phase. We also show how the mass loss affect their evolution, and can allow for some RSGs to evolve towards the blue side of the Hertzsprung-Russell diagram. We also propose observational tests that can help in better understanding the evolution of these stars.

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50

Christensen-Dalsgaard, Jørgen, and Michael J. Thompson. "Stellar hydrodynamics caught in the act: Asteroseismology with CoRoT and Kepler." Proceedings of the International Astronomical Union 6, S271 (2010): 32–61. http://dx.doi.org/10.1017/s1743921311017443.

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AbstractAsteroseismic investigations, particularly based on data on stellar oscillations from the CoRoT andKeplerspace missions, are providing unique possibilities for investigating the properties of stellar interiors. This constitutes entirely new ways to study the effects of dynamic phenomena on stellar structure and evolution. Important examples are the extent of convection zones and the associated mixing and the direct and indirect effects of stellar rotation. In addition, the stellar oscillations themselves show very interesting dynamic behaviour. Here we discuss examples of the results o

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